A friend of mine used a 1702 in his Masters thesis project. They were so dear he only had one. He managed to inject mains (230 VAC) into the 50 volt (!) programming rail and blew up the 1702 and other expensive chips (8008 cpu too). It took about 6 months to get more! I remember the TMS 2716 coming down in price after initially being much dearer - it came down to $NZ100 each ($US50) for a 2k x 8 device (3 supplies) - a real bargain at the time. About 1974 I think. Russell McMahon Auckland, New Zealand First to see the light (they tell me). -----Original Message----- From: Peter Greuter To: PICLIST@MITVMA.MIT.EDU Date: Thursday, September 10, 1998 4:38 AM Subject: Re[2]: Wiping Code Protected /JW devices >On Wed, 9 Sep 1998 11:03:40 -0400, >Martin Green wrote: > >>Russell McMahon asked: >> Long ago I lost many 2716 >> eproms (remember them? - if you do your old :-)) >> >>Not only do I remember them, but I remeber the 2708... >> >>THREE supply voltages, both positive and negative. Not much fun to use. >> >>Nostalgically - Martin. >> > > >... but before the 2708 was the 1602/1702 : 256 bytes ! > > programming time : 3 minutes > >It was featured with the 8008 in the MCS 8 microcomputer system > ( ca 1973 ) ; in the same system you could find also the > > 1101 with 256 ***bits*** of RAM ! > >The SIM8-01 board used 32 chips of them to implement > > 1 k bytes of RAM ! > > >Input/output to the systems was by Teletype ASR33 ( with paper tape >reader and puncher ). > >PL/M, Cross assembler, Fortran IV simulator but also the SIM 8 >assembler ( 2 passes on papertape source code ! ) proposed by Intel >could be used. > >Good old days ?? > >Kind regards from Paris > >-- > Peter Greuter > E-mail mailto:pgreuter@teaser.fr > Page Web http://www.teaser.fr/~pgreuter >